Correct answer is A
5x−y−4y−x
= 5(y−x)−4(x−y)(x−y)(y−x)
= 5y−5x−4x+4y(x−y)(y−x)
= 9y−9x(x−y)(y−x)
= 9(y−x)(x−y)(y−x)
= 9x−y
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